Securing diamonds in metallic plates for stone-saws



(.No Model.) v

A. H. LUUAS &, E. G. KEYS.

SEOURING DIAMONDS IN METALLIC PLATES FOR STONE SAWS.

No. 249,646. Patented Nov. 15,1881.

Vfizziizz 12142212 02 AUSTIN H. LUCAS AND EZRA O. KEYS, OF ALLEGHENY,PENNSYLVANIA.

SECURING DIAMONDS IN METALLIC PLATES FOR STONE-SAWS.

SPECIFICATION forming part of Letters Patent No. 249,646, dated November15, 1881. I

Application filedJuly 28,1881. N0 model.) A

To all whom it may concern:

Be it known that we, AUSTIN H. LUCAS and EZRA O. KEYs, citizens of theUnited States, residing at Allegheny, in the county of Allegheny andState of Pennsylvania, have in ven ted certain new and usefulImprovements in Securing Diamonds in Metallic Plates for Stone- Saws;and we do hereby declare thefollowingto be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanyin g drawings, and to letters or figures of referencemarked thereon, which form a part of this specification.

Our invention relates to an improvement in securing diamonds or carbonsin metallic plates that are to be clamped or wedged in openings in thesaw-blades for sawing stone, and in introducing a plate of'iridium infront of the' diamond to protect the diamond-holding plate against thedestructive action of sand during the operation of sawing.

The object of our inventi n1 is twofold: first, to secure the diamondsot' saws for sawing stone in their position; and, secondly, to protectthe metal plates in which the diamonds are embedded against the cuttingof the sand, which is very destructive in front of the diamonds.

The known processes of placing and securing diamonds in their properpositions on sawblades for sawing stone are very slow, difficult, andcostly, and require a degree of skill not attained by ordinarymechanics. It is therefore of great importance to discover a means bywhich the diamonds can be readily placed and rigidly held until wornout, when the holding-plate can be removed from the saw-plate to berecast and used again. There is also, aside from the placing and holdingof the diamonds in their proper positions, another difficultytoovercome-viz, the cutting away by the sand of the plate that holds thediamondwhich is so rapid as to require new plates before the diamondshave become unserviceable, and although the hardest steel has been usedfor making these plates they only have in part answered the purpose. Toremove these 01)- jectionable features we have made the improvementshereinafter described.

The accompanying drawings represent our invention.

Figure 1 represents a side view of the holding-plate with the diamondinserted. Fig. 2 shows the holding-plate with a diamond and a plate ofiridium in front of it.

The holding-plate A is similar in form to thatshown in PatentNo.180,429, tapering from the heel to its somewhat thicker rounded upperedge that protrudes beyond the edge of the saw-blade. This plate isinserted into a fittin g-openin g in the saw-blade, and there confinedby wedges from underneath and kept from sliding sidewise by means ofgrooves at its straight side edges and corresponding V- bevels on thesaw-blade. In the center of the plate A is an opening, from whichextends up ward to the base of the diamonda narrow slit, to, which maybe outafter the diamond has been embedded, or be made in casting of theplate. The slit a is to impart a degree ofcompressibility to the upperend of the plate A, for additionally securing the diamond placed above.The plate A may also be made of two equal parts jointed longitudinally,and to increase its elasticity incisions b may be made, as shown in thesaid patent.

The material .we use for the plate Ais what is commonly calledphosphor-bronze metal. This, when melted, is run into molds, to bechilled. In the molds, previous to .the introduction of the metal, thediamonds care placed and adjusted so that the metal, when poured in,surrounds and holds them. This metal possesses great hardness withpliability, by

which it is peculiarly adapted for the purpose,

and from experience it is ascertained that it holdsthe diamondsbetterthan anyotherknown substance. In front of the diamond, in theupper edge of the plate A, is a slight cavity dovetailed at its sides,and into this a plate, 6, of iridium is forced toward and in contactwith the diamond; or the iridium may be placed in the mold with thediamond and attached to the plate in the casting, either of whichanswers the same purpose. The plate of iridium, being ofgreater hardness than any other metal known,

prevents the sand from cutting the plateA at cured thereto, with a pieceof iridium, which the base of the diamond, and assists to some isinserted in the edge of the plate in advance extent in cutting thestone, and may, when of thecutting-point,substantially as described.

properly shaped, be used for cutting the softer 3. A saw for cuttingstone, provided with 15 kind of stones without the diamond. pieces ofiridium, which are inserted in its cut- Having thus described ourinvention, we ting-edges, substantially as set forth. clain1 AUSTIN H.LUCAS.

1. In a saw, the plate A, made of phosphor- EZRA O. KEYS. bronze metal,substantially as shown.

2. In a saw, the combination of a removable plate having a diamond orcutting-point se- I Witnesses:

T. F. LEHMANN, J AMES MEsKILL.

